Fan without blades invented October 14, 2009Posted by nikmj in electricity, news.
Tags: Fan without blades invented, Kipas tanpa bilah dicipta
From the man who invented the bagless vacuum cleaner comes an idea that will really blow you away – a fan with no blades.
Sir James Dyson’s Air Multiplier radically alters the design of the fan for the first time since American engineer Dr Schuyler Wheeler came up with a twin-blade version in 1886.
The device works by sucking in air, boosting its speed by 15 times then pumping it out at 405 litres per second. And instead of spinning blades, the Air Multiplier has a hole.
Sir James came up with the idea while working on his revolutionary hand drier, the Air Blade. He realised if the air pushed out could be channelled into a stream it could be used as a fan.
He said: “I’ve always been disappointed by fans because their spinning blades chop up the air to give a buffeting effect. They’re hard to clean and children have to be watched in case they stick their fingers through the grille.”
To demonstrate how safe it is, he flicks on the switch, sticks his hand through the centre and puts his head through. He grins like a magician and says: “Look no blades.” At £199, Dyson’s Air Multiplier is not cheap, but Britain’s top inventor hopes it will change the face of fans – just like he did for vacuum cleaners.
How the Air Multiplier works
1 Air is sucked in through a motor at the base
2 From there it enters the loop which has 1.3mm gaps running all the way around the inner circle
3 The air races through the loop picking up speed and is forced over a curved ramp within the loop gathering pace like a mini tornado
4 As it multiplies its speed by 15, the air finally gets pushed out
Courtesy of mirror.co.uk